Table 3 Free amino acid profile of the leg muscle during 7-week storage at −20 °C
Amino acid | Storage period (week) | ||||
|---|---|---|---|---|---|
0 | 1 | 3 | 5 | 7 | |
Nutritionally non-essential amino acid (mg 100 g−1, wet base) | |||||
Alanine | 270.9 | 264.5 | 278.4 | 264.3 | 176.0 |
Aspartic acid | 1.2 | 3.9 | 4.8 | 4.2 | 5.3 |
Glutamic acid | 26.0 | 21.2 | 10.7 | 26.9 | 26.6 |
Glycine | 657.0 | 582.8 | 562.8 | 450.1 | 359.3 |
Tyrosine | 59.1 | 20.9 | 31.7 | 19.5 | 20.0 |
Sum | 1014.2 | 893.3 | 888.4 | 765.0 | 567.2 |
Nutritionally essential amino acid (mg 100 g−1, wet base) | |||||
Threonine | 1.3 | 7.0 | 18.3 | 5.1 | 21.5 |
Valine | 58.1 | 46.2 | 59.4 | 56.2 | 53.2 |
Methionine | 60.5 | 33.4 | 43.1 | 59.6 | 47.9 |
Isoleucine | 53.3 | 37.3 | 36.8 | 50.6 | 39.1 |
Leucine | 68.9 | 52.3 | 44.4 | 65.4 | 72.8 |
Phenylalanine | 61.8 | 39.1 | 51.0 | 42.0 | 36.6 |
Lysine | 91.7 | 83.0 | 93.2 | 121.1 | 71.7 |
Arginine | 672.6 | 609.3 | 293.3 | 387.2 | 231.2 |
Sum | 1068.2 | 907.6 | 639.5 | 787.2 | 573.7 |
Other amino acid (mg 100 g−1, wet base) | |||||
Phosphoserine | 3.8 | 8.8 | 4.5 | 6.8 | 5.3 |
Taurine | 210.0 | 172.7 | 192.9 | 182.6 | 135.0 |
Sarcosine | 75.1 | 58.7 | 68.7 | 47.2 | 53.8 |
Ammonia | 19.7 | 12.2 | 7.6 | 9.8 | 12.7 |
Sum | 308.6 | 252.4 | 273.7 | 246.4 | 206.8 |
Total | 2391.0 | 2053.3 | 1801.6 | 1798.6 | 1347.7 |